Delivery System, Delivery Method and Delivery Device

1. A delivery system comprising a terminal device and a delivery device, wherein the terminal device includes: a first memory; and a first processor coupled to the first memory and configured to execute a first process including; requesting a connection request to the delivery device configured to deliver information; and requesting an update request to the delivery device to update information to be delivered when the terminal device is connected to the delivery device, the delivery device includes; a second memory configured to store delivery target information; a second professor coupled to the second memory and configured to execute a second process including; delivering the delivery target information stored in the second memory; interrupting the delivery, when the connection request is requested by the terminal device, and performing switching to connect to the terminal device; authenticating the terminal device; restarting the delivering when an authentication result as a proper terminal by the authenticating is not obtained in a first predetermined period; and updating the delivery target information stored in the second memory in response to the update request from the terminal device, when the authentication result as a proper terminal by the authenticating is obtained in the first predetermined period.

2. The delivery system according to claim 1 , wherein in the restarting, the switching is suspended for a second predetermined period even when the terminal device makes a connection request.

3. The delivery system according to claim 1 , wherein delivering further includes generating a challenge code using internal information of the delivery device and notifying the terminal device of the challenge code, when the switching is performed, the first process further includes requesting authentication by sending the delivery device authentication information which is a predetermined code for use in authentication encrypted with the challenge code, and in the authenticating, the authentication information received from the terminal device, the challenge code, and the predetermined code are used.

4. The delivery system according to claim 3 , wherein in the generating a challenge code, the internal information includes at least time information of the delivery device.

5. A delivery method to be executed by a terminal device and a delivery device, the method comprising: causing the terminal device to make a connection request to the delivery device configured to deliver information, and request the delivery device to update information to be delivered when the terminal device is connected to the delivery device; and causing the delivery device to deliver delivery target information stored in a storage unit, interrupt delivery of the delivery target information and perform switching to connect to the terminal device, when the connection request is made by the terminal device, authenticate the terminal device, restart delivery of the delivery target information when an authentication result as a proper terminal is not obtained in a first predetermined period, and update the delivery target information stored in the storage unit in response to a request from the terminal device when the authentication result as a proper terminal is obtained in the first predetermined period.

6. A delivery device, comprising: a memory configured to store delivery target information; a processor coupled to the memory and configured to execute a process including; delivering the delivery target information stored in the memory; interrupting the delivering, when a connection request is made by a terminal device, and performing switching to connect to the terminal device; authenticating the terminal device at the time of the switching; restarting the delivering when an authentication result as a proper terminal by the authenticating is not obtained in a first predetermined period; and updating the delivery target information stored in the memory in response to a request from the terminal device, when the authentication result as a proper terminal by the authenticating is obtained in the first predetermined period.